Special Section on Laser Applications in Life Sciences

Photoinduced spectral changes of photoluminescent gold nanoclusters

[+] Author Affiliations
Marija Matulionytė

National Cancer Institute, Biomedical Physics Laboratory, P. Baublio Street 3b, LT-08406 Vilnius, Lithuania

Vilnius University, Biophotonics Group of Laser Research Centre, Sauletekio Avenue 9, LT-10222 Vilnius, Lithuania

Raminta Marcinonytė

National Cancer Institute, Biomedical Physics Laboratory, P. Baublio Street 3b, LT-08406 Vilnius, Lithuania

Ričardas Rotomskis

National Cancer Institute, Biomedical Physics Laboratory, P. Baublio Street 3b, LT-08406 Vilnius, Lithuania

Vilnius University, Biophotonics Group of Laser Research Centre, Sauletekio Avenue 9, LT-10222 Vilnius, Lithuania

J. Biomed. Opt. 20(5), 051018 (Dec 17, 2014). doi:10.1117/1.JBO.20.5.051018
History: Received September 3, 2014; Accepted November 11, 2014
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Abstract.  Ultrasmall photoluminescent gold nanoclusters (Au NCs), composed of several atoms with sizes up to a few nanometers, have recently stimulated extensive interest. Unique molecule-like behaviors, low toxicity, and facile synthesis make photoluminescent Au NCs a very promising alternative to organic fluorophores and semiconductor quantum dots (QDs) in broad ranges of biomedical applications. However, using gold nanoparticles (Au NPs) for bioimaging might cause their degradation under continuous excitation with UV light, which might result in toxicity. We report spectral changes of photoluminescent 2-(N-morpholino) ethanesulfonic acid (MES)-coated (Au-MES) NCs under irradiation with UV/blue light. Photoluminescent water soluble Au-MES NCs with a photoluminescence (PL) band maximum at 476 nm (λex=420nm) were synthesized. Under irradiation with 402 nm wavelength light the size of photoluminescent Au-MES NCs decreased (λem=430nm). Irradiating the sample solution with 330 nm wavelength light, nonluminescent Au NPs were disrupted, and photoluminescent Au NCs (λem=476nm) were formed. Irradiation with 330 nm wavelength light did not directly affect photoluminescent Au-MES NCs, however, increase in PL intensity indicated the formation of photoluminescent Au NCs from the disrupted nonluminescent Au NPs. This study gives a good insight into the photostability of MES-coated Au NPs under continuous excitation with UV/blue light.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Marija Matulionytė ; Raminta Marcinonytė and Ričardas Rotomskis
"Photoinduced spectral changes of photoluminescent gold nanoclusters", J. Biomed. Opt. 20(5), 051018 (Dec 17, 2014). ; http://dx.doi.org/10.1117/1.JBO.20.5.051018


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